Quercus ilex chorology

Distribution map of holm oak (<i>Quercus ilex</i>)<br><br>These maps were produced by combining numerous and heterogeneous data collected from atlas monographs providing complete species distribution maps, from national to regional atlases, occurrence geodatabases and scientific literature.<br>The maps were created using ESRI shapefiles (*.shp, *.shx, *.dbf, *.prj files) archived in the ZIP file. Species range is mapped with polygon features (name suffix “plg”), which define continuous areas of occupancy of the species, and with point features (name suffix “pnt”), which identify more fragmented and isolated populations. If synanthropic occurrences are reported outside the species natural range, additional point and/or polygon shapefiles are also present (suffix “syn”).<br>All polygon borders delimiting the range are generalized across the mainland and sea boundaries, and not clipped to a specific coastline. This offers the possibility to mask sea areas, or to clip and extract the terrestrial range parts using GIS data layers of the users’ choice. <br><br>Please cite as:<br>Caudullo, G., Welk, E., San-Miguel-Ayanz, J., 2017. Chorological maps for the main European woody species. Data in Brief 12, 662-666. DOI: doi.org/10.1016/j.dib.2017.05.007 <br><br>Additional information and used references are on 'supplementary materials' document:<br>https://doi.org/10.6084/m9.figshare.5091901<br><br>Chorological maps are part of the "European Atlas of Forest Tree Species" project:<br>https://w3id.org/mtv/FISE-Comm/v01

冬青栎（Quercus ilex）分布地图

本套地图通过整合多源异构数据制作而成，数据来源涵盖完整提供物种分布地图的专题图集、国家级至区域级的植物分布图集、物种出现点地理数据库以及学术文献。

本套地图采用存档于ZIP压缩包内的ESRI形状文件（*.shp、*.shx、*.dbf、*.prj）制作。物种分布范围通过两类要素表达：一是面要素（文件名后缀为"plg"），用于表征物种连续分布的栖息区域；二是点要素（文件名后缀为"pnt"），用于标识更为破碎、孤立的种群。若存在物种自然分布范围之外的人为伴生出现记录，还将附带额外的点或面形状文件（后缀为"syn"）。

所有用于界定物种分布范围的面要素边界已针对陆地与海洋边界进行了概化处理，并未裁剪至特定海岸线。使用者可根据自身需求，通过自定义的地理信息系统（Geographic Information System, GIS）数据图层对海洋区域进行遮蔽，或裁剪并提取其中的陆地分布范围。

引用格式如下：
Caudullo, G., Welk, E., San-Miguel-Ayanz, J., 2017. 欧洲主要木本物种分布区地图. Data in Brief 12, 662-666. DOI: doi.org/10.1016/j.dib.2017.05.007

更多相关信息及参考文献详见补充材料文档：
https://doi.org/10.6084/m9.figshare.5091901

本分布区地图隶属于"欧洲林木树种图集"（European Atlas of Forest Tree Species）项目：
https://w3id.org/mtv/FISE-Comm/v01